Enhancement: DW News Feed

[teledyn]

I won't pretend to be confident enough to submit a PR, but for those interested, here is the block of code needed to add Deutche-Welle hourly news in English.

            "DW": {
                "aliases": ["DW News", "DW", "DW News Channel"],
                "uri": "rss//https://rss.dw.com/syndication/feeds/podcast_en_newsbrief.33191-mrss.xml",
                "match_types": [MediaType.NEWS],
                "playback": PlaybackType.AUDIO,
                "media_type": MediaType.NEWS,
                "image": join(dirname(__file__), "ui", "images", "DW.png"),
                "secondary_langs": ["en"]
            },

The needed png file lives at https://static.dw.com/image/55134716_7.png as specified in the xml.